The superficial similarity between the properties of solitons and of elementary particles is striking. Solitons may propagate without change of form. A solitons may be regarded as a local confinement of the energy of the wave field. When two solitons collide, each may come away with the same character as it had before the collision. When a soliton meets and antisoliton, both may be anhihilated. Elementary particles share these properties. So, if an appropiate system of nonlinear field equations admits soliton solutions then theses solitons may represent elementary particles and have properties which may be confirmed by observations of particles.
(Drazin, Solitons: an introduction)
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